#!/usr/bin/env python
import sys
import os
import os.path
import re

from argparse import ArgumentParser
from argparse import FileType
from pprint import pprint
import shlex
import subprocess
from subprocess import check_call
from subprocess import Popen
from subprocess import PIPE
from subprocess import CalledProcessError
from datetime import datetime
from time import sleep
from errno import ESRCH
import termcolor
from random import random
import commands
import multiprocessing
from contextlib import closing


MESSAGES_TO_RETRY = [
    "DB::Exception: ZooKeeper session has been expired",
    "Coordination::Exception: Connection loss",
]


def remove_control_characters(s):
    """
    https://github.com/html5lib/html5lib-python/issues/96#issuecomment-43438438
    """
    def str_to_int(s, default, base=10):
        if int(s, base) < 0x10000:
            return unichr(int(s, base))
        return default
    s = re.sub(r"&#(\d+);?", lambda c: str_to_int(c.group(1), c.group(0)), s)
    s = re.sub(r"&#[xX]([0-9a-fA-F]+);?", lambda c: str_to_int(c.group(1), c.group(0), base=16), s)
    s = re.sub(r"[\x00-\x08\x0b\x0e-\x1f\x7f]", "", s)
    return s

def run_single_test(args, ext, server_logs_level, case_file, stdout_file, stderr_file):
    if ext == '.sql':
        command = "{0} --send_logs_level={1} --testmode --multiquery < {2} > {3} 2> {4}".format(args.client_with_database, server_logs_level, case_file, stdout_file, stderr_file)
    else:
        command = "{} > {} 2> {}".format(case_file, stdout_file, stderr_file)

    proc = Popen(command, shell = True)
    start_time = datetime.now()
    while (datetime.now() - start_time).total_seconds() < args.timeout and proc.poll() is None:
        sleep(0.01)

    stdout = open(stdout_file, 'r').read() if os.path.exists(stdout_file) else ''
    stdout = unicode(stdout, errors='replace', encoding='utf-8')
    stderr = open(stderr_file, 'r').read() if os.path.exists(stderr_file) else ''
    stderr = unicode(stderr, errors='replace', encoding='utf-8')

    return proc, stdout, stderr

def need_retry(stderr):
    return any(msg in stderr for msg in MESSAGES_TO_RETRY)

def get_processlist(client_cmd):
    try:
        return subprocess.check_output("{} --query 'SHOW PROCESSLIST FORMAT Vertical'".format(client_cmd), shell=True)
    except:
        return "" #  server seems dead

def get_stacktraces(server_pid):
    cmd = "gdb -q -ex 'set pagination off' -ex 'backtrace' -ex 'thread apply all backtrace' -ex 'detach' -ex 'quit' --pid {} 2>/dev/null".format(server_pid)
    try:
        return subprocess.check_output(cmd, shell=True)
    except Exception as ex:
        return "Error occured while receiving stack traces {}".format(str(ex))

def get_server_pid(server_tcp_port):
    cmd = "lsof -i tcp:{port} | grep '*:{port}'".format(port=server_tcp_port)
    try:
        output = subprocess.check_output(cmd, shell=True)
        if output:
            columns = output.strip().split(' ')
            return int(columns[1])
        else:
            return None # server dead
    except Exception as ex:
        return None

def colored(text, args, color=None, on_color=None, attrs=None):
       if sys.stdout.isatty() or args.force_color:
           return termcolor.colored(text, color, on_color, attrs)
       else:
           return text

SERVER_DIED = False
exit_code = 0


#def run_tests_array(all_tests, suite, suite_dir, suite_tmp_dir, run_total):
def run_tests_array(all_tests_with_params):
    all_tests, suite, suite_dir, suite_tmp_dir, run_total = all_tests_with_params
    global exit_code
    global SERVER_DIED

    OP_SQUARE_BRACKET = colored("[", args, attrs=['bold'])
    CL_SQUARE_BRACKET = colored("]", args, attrs=['bold'])

    MSG_FAIL = OP_SQUARE_BRACKET + colored(" FAIL ", args, "red", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_UNKNOWN = OP_SQUARE_BRACKET + colored(" UNKNOWN ", args, "yellow", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_OK = OP_SQUARE_BRACKET + colored(" OK ", args, "green", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_SKIPPED = OP_SQUARE_BRACKET + colored(" SKIPPED ", args, "cyan", attrs=['bold']) + CL_SQUARE_BRACKET

    passed_total = 0
    skipped_total = 0
    failures_total = 0
    failures = 0
    failures_chain = 0

    if len(all_tests):
        print("\nRunning {} {} tests.".format(len(all_tests), suite) + "\n")

    for case in all_tests:
        if SERVER_DIED:
            break

        case_file = os.path.join(suite_dir, case)
        (name, ext) = os.path.splitext(case)

        try:
            sys.stdout.write("{0:72}".format(name + ": "))
            if run_total == 1:
                sys.stdout.flush()

            if args.skip and any(s in name for s in args.skip):
                print(MSG_SKIPPED + " - skip")
                skipped_total += 1
            elif not args.zookeeper and 'zookeeper' in name:
                print(MSG_SKIPPED + " - no zookeeper")
                skipped_total += 1
            elif not args.shard and ('shard' in name
                    or 'distributed' in name
                    or 'global' in name):
                print(MSG_SKIPPED + " - no shard")
                skipped_total += 1
            elif not args.no_long and 'long' in name:
                print(MSG_SKIPPED + " - no long")
                skipped_total += 1
            else:
                disabled_file = os.path.join(suite_dir, name) + '.disabled'

                if os.path.exists(disabled_file) and not args.disabled:
                    message = open(disabled_file, 'r').read()
                    print(MSG_SKIPPED + " - " + message)
                else:

                    if args.testname:
                        clickhouse_proc = Popen(shlex.split(args.client_with_database), stdin=PIPE, stdout=PIPE, stderr=PIPE)
                        clickhouse_proc.communicate("SELECT 'Running test {suite}/{case} from pid={pid}';".format(pid = os.getpid(), case = case, suite = suite))

                    reference_file = os.path.join(suite_dir, name) + '.reference'
                    stdout_file = os.path.join(suite_tmp_dir, name) + '.stdout'
                    stderr_file = os.path.join(suite_tmp_dir, name) + '.stderr'

                    proc, stdout, stderr = run_single_test(args, ext, server_logs_level, case_file, stdout_file, stderr_file)
                    if proc.returncode is None:
                        try:
                            proc.kill()
                        except OSError as e:
                            if e.errno != ESRCH:
                                raise

                        failures += 1
                        print("{0} - Timeout!".format(MSG_FAIL))
                    else:
                        counter = 1
                        while proc.returncode != 0 and need_retry(stderr):
                            proc, stdout, stderr = run_single_test(args, ext, server_logs_level, case_file, stdout_file, stderr_file)
                            sleep(2**counter)
                            counter += 1
                            if counter > 6:
                                break

                        if proc.returncode != 0:
                            failures += 1
                            failures_chain += 1
                            print("{0} - return code {1}".format(MSG_FAIL, proc.returncode))

                            if stderr:
                                print(stderr.encode('utf-8'))

                            if args.stop and ('Connection refused' in stderr or 'Attempt to read after eof' in stderr) and not 'Received exception from server' in stderr:
                                SERVER_DIED = True

                        elif stderr:
                            failures += 1
                            failures_chain += 1
                            print("{0} - having stderror:\n{1}".format(MSG_FAIL, stderr.encode('utf-8')))
                        elif 'Exception' in stdout:
                            failures += 1
                            failures_chain += 1
                            print("{0} - having exception:\n{1}".format(MSG_FAIL, stdout.encode('utf-8')))
                        elif not os.path.isfile(reference_file):
                            print("{0} - no reference file".format(MSG_UNKNOWN))
                        else:
                            result_is_different = subprocess.call(['diff', '-q', reference_file, stdout_file], stdout = PIPE)

                            if result_is_different:
                                diff = Popen(['diff', '--unified', reference_file, stdout_file], stdout = PIPE).communicate()[0]
                                failures += 1
                                print("{0} - result differs with reference:\n{1}".format(MSG_FAIL, diff))
                            else:
                                passed_total += 1
                                failures_chain = 0
                                print(MSG_OK)
                                if os.path.exists(stdout_file):
                                    os.remove(stdout_file)
                                if os.path.exists(stderr_file):
                                    os.remove(stderr_file)
        except KeyboardInterrupt as e:
            print(colored("Break tests execution", args, "red"))
            raise e
        except:
            import traceback
            exc_type, exc_value, tb = sys.exc_info()
            failures += 1
            print("{0} - Test internal error: {1}\n{2}\n{3}".format(MSG_FAIL, exc_type.__name__, exc_value, "\n".join(traceback.format_tb(tb, 10))))

        if failures_chain >= 20:
            break

    failures_total = failures_total + failures

    if failures_total > 0:
        print(colored("\nHaving {failures_total} errors! {passed_total} tests passed. {skipped_total} tests skipped.".format(passed_total = passed_total, skipped_total = skipped_total, failures_total = failures_total), args, "red", attrs=["bold"]))
        exit_code = 1
    else:
        print(colored("\n{passed_total} tests passed. {skipped_total} tests skipped.".format(passed_total = passed_total, skipped_total = skipped_total), args, "green", attrs=["bold"]))

server_logs_level = "warning"

def main(args):
    global SERVER_DIED
    global exit_code
    global server_logs_level

    def is_data_present():
        clickhouse_proc = Popen(shlex.split(args.client), stdin=PIPE, stdout=PIPE, stderr=PIPE)
        (stdout, stderr) = clickhouse_proc.communicate("EXISTS TABLE test.hits")
        if clickhouse_proc.returncode != 0:
            raise CalledProcessError(clickhouse_proc.returncode, args.client, stderr)

        return stdout.startswith('1')

    base_dir = os.path.abspath(args.queries)
    tmp_dir = os.path.abspath(args.tmp)

    # Keep same default values as in queries/shell_config.sh
    os.environ.setdefault("CLICKHOUSE_BINARY", args.binary)
    #os.environ.setdefault("CLICKHOUSE_CLIENT", args.client)
    os.environ.setdefault("CLICKHOUSE_CONFIG", args.configserver)
    if args.configclient:
        os.environ.setdefault("CLICKHOUSE_CONFIG_CLIENT", args.configclient)
    os.environ.setdefault("CLICKHOUSE_TMP", tmp_dir)
    os.environ.setdefault("CLICKHOUSE_DATABASE", args.database)

    # Force to print server warnings in stderr
    # Shell scripts could change logging level
    os.environ.setdefault("CLICKHOUSE_CLIENT_SERVER_LOGS_LEVEL", server_logs_level)

    if args.zookeeper is None:
        code, out = commands.getstatusoutput(args.extract_from_config +" --try --config " + args.configserver + ' --key zookeeper | grep . | wc -l')
        try:
            if int(out) > 0:
                args.zookeeper = True
            else:
                args.zookeeper = False
        except ValueError:
            args.zookeeper = False

    if args.shard is None:
        code, out = commands.getstatusoutput(args.extract_from_config + " --try --config " + args.configserver + ' --key listen_host | grep -E "127.0.0.2|::"')
        if out:
            args.shard = True
        else:
            args.shard = False

    clickhouse_proc_create = Popen(shlex.split(args.client), stdin=PIPE, stdout=PIPE, stderr=PIPE)
    clickhouse_proc_create.communicate("CREATE DATABASE IF NOT EXISTS " + args.database)
    if args.database != "test":
        clickhouse_proc_create = Popen(shlex.split(args.client), stdin=PIPE, stdout=PIPE, stderr=PIPE)
        clickhouse_proc_create.communicate("CREATE DATABASE IF NOT EXISTS test")

    def is_test_from_dir(suite_dir, case):
        case_file = os.path.join(suite_dir, case)
        (name, ext) = os.path.splitext(case)
        return os.path.isfile(case_file) and (ext == '.sql' or ext == '.sh' or ext == '.py')

    def sute_key_func(item):
       if args.order == 'random':
             return random()

       if -1 == item.find('_'):
           return 99998

       prefix, suffix = item.split('_', 1)

       try:
           return int(prefix), suffix
       except ValueError:
           return 99997

    for suite in sorted(os.listdir(base_dir), key=sute_key_func):
        if SERVER_DIED:
            break

        suite_dir = os.path.join(base_dir, suite)
        suite_re_obj = re.search('^[0-9]+_(.*)$', suite)
        if not suite_re_obj: #skip .gitignore and so on
            continue

        suite_tmp_dir = os.path.join(tmp_dir, suite)
        if not os.path.exists(suite_tmp_dir):
            os.makedirs(suite_tmp_dir)

        suite = suite_re_obj.group(1)
        if os.path.isdir(suite_dir):

            if 'stateful' in suite and not args.no_stateful and not is_data_present():
                print("Won't run stateful tests because test data wasn't loaded.")
                continue
            if 'stateless' in suite and args.no_stateless:
                print("Won't run stateless tests because they were manually disabled.")
                continue
            if 'stateful' in suite and args.no_stateful:
                print("Won't run stateful tests because they were manually disabled.")
                continue

            # Reverse sort order: we want run newest test first.
            # And not reverse subtests
            def key_func(item):
                if args.order == 'random':
                    return random()

                reverse = 1 if args.order == 'asc' else -1

                if -1 == item.find('_'):
                    return 99998

                prefix, suffix = item.split('_', 1)

                try:
                    return reverse * int(prefix), suffix
                except ValueError:
                    return 99997

            all_tests = os.listdir(suite_dir)
            all_tests = filter(lambda case: is_test_from_dir(suite_dir, case), all_tests)
            all_tests = sorted(filter(lambda case: re.search(args.test, case) if args.test else True, all_tests), key=key_func)

            run_n, run_total = args.parallel.split('/')
            run_n = float(run_n)
            run_total = float(run_total)
            tests_n = len(all_tests)
            if run_total > tests_n:
                run_total = tests_n
            if run_n > run_total:
                continue

            jobs = args.jobs
            if jobs > tests_n:
                jobs = tests_n
            if jobs > run_total:
                run_total = jobs

            all_tests_array = []
            for n in range(1, 1 + int(run_total)):
                start = int(tests_n / run_total * (n - 1))
                end = int(tests_n / run_total * n)
                all_tests_array.append([all_tests[start : end], suite, suite_dir, suite_tmp_dir, run_total])

            if jobs > 1:
                with closing(multiprocessing.Pool(processes=jobs)) as pool:
                    pool.map(run_tests_array, all_tests_array)
                    pool.terminate()
            else:
                run_tests_array(all_tests_array[int(run_n)-1])

    if args.hung_check:
        processlist = get_processlist(args.client_with_database)
        if processlist:
            server_pid = get_server_pid(os.getenv("CLICKHOUSE_PORT_TCP", '9000'))
            print(colored("\nFound hung queries in processlist:", args, "red", attrs=["bold"]))
            print(processlist)
            if server_pid:
                print("\nStacktraces of all threads:")
                print(get_stacktraces(server_pid))
            exit_code = 1
        else:
            print(colored("\nNo queries hung.", args, "green", attrs=["bold"]))

    sys.exit(exit_code)


def find_binary(name):
    if os.path.exists(name) and os.access(name, os.X_OK):
        return True
    paths = os.environ.get("PATH").split(':')
    for path in paths:
        if os.access(os.path.join(path, name), os.X_OK):
            return True

    # maybe it wasn't in PATH
    return os.access(os.path.join('/usr/bin', name), os.X_OK)

if __name__ == '__main__':
    parser=ArgumentParser(description='ClickHouse functional tests')
    parser.add_argument('-q', '--queries', help='Path to queries dir')
    parser.add_argument('--tmp', help='Path to tmp dir')
    parser.add_argument('-b', '--binary', default='clickhouse', help='Path to clickhouse binary or name of binary in PATH')
    parser.add_argument('-c', '--client', help='Client program')
    parser.add_argument('--extract_from_config', help='extract-from-config program')
    parser.add_argument('--configclient', help='Client config (if you use not default ports)')
    parser.add_argument('--configserver', default= '/etc/clickhouse-server/config.xml', help='Preprocessed server config')
    parser.add_argument('-o', '--output', help='Output xUnit compliant test report directory')
    parser.add_argument('-t', '--timeout', type=int, default=600, help='Timeout for each test case in seconds')
    parser.add_argument('test', nargs='?', help='Optional test case name regex')
    parser.add_argument('-d', '--disabled', action='store_true', default=False, help='Also run disabled tests')
    parser.add_argument('--stop', action='store_true', default=None, dest='stop', help='Stop on network errors')
    parser.add_argument('--order', default='desc', help='Run order (asc, desc, random)')
    parser.add_argument('--testname', action='store_true', default=None, dest='testname', help='Make query with test name before test run')
    parser.add_argument('--hung-check', action='store_true', default=False)
    parser.add_argument('--force-color', action='store_true', default=False)
    parser.add_argument('--database', default='test', help='Default database for tests')
    parser.add_argument('--parallel', default='1/1', help='One parallel test run number/total')
    parser.add_argument('-j', '--jobs', default=1, help='Run all tests in parallel', type=int) # default=multiprocessing.cpu_count()

    parser.add_argument('--no-stateless', action='store_true', help='Disable all stateless tests')
    parser.add_argument('--no-stateful', action='store_true', help='Disable all stateful tests')
    parser.add_argument('--skip', nargs='+', help="Skip these tests")
    parser.add_argument('--no-long', action='store_false', dest='no_long', help='Do not run long tests')
    group=parser.add_mutually_exclusive_group(required=False)
    group.add_argument('--zookeeper', action='store_true', default=None, dest='zookeeper', help='Run zookeeper related tests')
    group.add_argument('--no-zookeeper', action='store_false', default=None, dest='zookeeper', help='Do not run zookeeper related tests')
    group=parser.add_mutually_exclusive_group(required=False)
    group.add_argument('--shard', action='store_true', default=None, dest='shard', help='Run sharding related tests (required to clickhouse-server listen 127.0.0.2 127.0.0.3)')
    group.add_argument('--no-shard', action='store_false', default=None, dest='shard', help='Do not run shard related tests')

    args = parser.parse_args()

    if args.queries is None and os.path.isdir('queries'):
        args.queries = 'queries'
    elif args.queries is None:
        if (os.path.isdir('/usr/local/share/clickhouse-test/queries')):
            args.queries = '/usr/local/share/clickhouse-test/queries'
        if (args.queries is None and os.path.isdir('/usr/share/clickhouse-test/queries')):
            args.queries = '/usr/share/clickhouse-test/queries'
        if args.tmp is None:
            args.tmp = '/tmp/clickhouse-test'
    if args.queries is None:
        print_err("Failed to detect path to the queries directory. Please specify it with '--queries' option.")
        exit(1)
    if args.tmp is None:
        args.tmp = args.queries
    if args.client is None:
        if find_binary(args.binary + '-client'):
            args.client = args.binary + '-client'
        elif find_binary(args.binary):
            args.client = args.binary + ' client'
        else:
            print("No 'clickhouse' binary found in PATH")
            parser.print_help()
            exit(1)

        if args.configclient:
            args.client += ' --config-file=' + args.configclient
        if os.getenv("CLICKHOUSE_HOST"):
            args.client += ' --host=' + os.getenv("CLICKHOUSE_HOST")
        if os.getenv("CLICKHOUSE_PORT_TCP"):
            args.client += ' --port=' + os.getenv("CLICKHOUSE_PORT_TCP")
        if os.getenv("CLICKHOUSE_DATABASE"):
            args.client += ' --database=' + os.getenv("CLICKHOUSE_DATABASE")

    args.client_with_database = args.client
    if args.database:
        args.client_with_database += ' --database=' + args.database

    if args.extract_from_config is None:
        if os.access(args.binary + '-extract-from-config', os.X_OK):
            args.extract_from_config = args.binary + '-extract-from-config'
        else:
            args.extract_from_config = args.binary + ' extract-from-config'

    main(args)